The vapor pressure of pure methyl alcohol at 19 degrees celcius is 90.0 torr and that of pure ethyl alcohol is 40.0 torr. Assume a mixture of methyl alcohol and ethyl alcohol is ideal. What is the vapor pressure at 19 degrees celcius of ethyl alcohol in equilibrium with a solution prepared by mixing 1.6 moles of methyl alcohol with 3.9 moles of ethyl alcohol